Designing and Experimentally Testing a Magnetic Gearbox for a Wind Turbine Demonstrator

Li, Kang; Modaresahmadi, Sina; Williams, W. Larry; Wright, Jason D.; Som, Debarupa; Bird, Jonathan Z.

doi:10.1109/tia.2019.2905838

Cited by 30 publications

(6 citation statements)

References 23 publications

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“…As shown in Figure 39(a), substitution of the mechanical gears by the FMMGs proves to be an efficient approach to improve the reliability of wind-turbine drive train because that the power transformation could be accomplished in a contactless manner, together with which the lubrication is reduced and inherent overload protection is accessible [157][158][159][160][161][162]. As displayed in Figure 39(b), the system torque density could be further improved by applying the MGPM generator to replace both the FMMG and the DFIG [163][164][165].…”

Section: Potential Applicationsmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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As a type of magnetic device being able to realize contact‐free power transmission together with sufficient volumetric torque density, the field‐modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high‐performance MGs.

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Section: Potential Applicationsmentioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

IET Electric Power Appl

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“…This is shown in ( 8) and ( 9) and represents the effective pole pair and modulator segment relationship. Equations ( 10) and (11) describe the relationship between the components' angular velocities:…”

Section: Principle Of Operationmentioning

confidence: 99%

“…In this configuration, the low pole-count and high pole-count PM carriers are often referred as high-speed (HS) rotor and low-speed (LS) rotor, respectively. Although radial flux FMMG is the most common [10][11][12][13][14][15], based on the same working principle, the FMMG can also be designed for axial flux topology [16,17] as shown in Figure 2. Since the two PM carriers have different pole-pairs and rotate asynchronously, their relative angular positions with regard to the pole-pieces of the flux modulator are not as simple and intuitive as for classical electrical machines [18].…”

Section: Introductionmentioning

confidence: 99%

Load Angle of Flux Modulated Magnetic Gears

Wang,

Holm,

Scheepers

et al. 2023

PIER C

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In this paper, the authors address the issue of flux-modulated magnetic gear (FMMG), which offers many potential advantages over traditional mechanical gears for a wide range of applications.In the proposed FMMG model, two permanent magnet (PM) carriers are of different pole-pairs and rotate asynchronously, and their relative angular position with respect to the pole parts of the flux modulator is not as straightforward and simple as it may seem in conventional electrical machines. Therefore, this paper focuses on the details of the derivation of FMMG load angle, which attempts to better express the angular relationship between the individual components of an FMMG. Finite element method (FEM) simulations and experiments are used to validate the load angle concept and corresponding results, and are complemented by experimental measurements. It is believed that the concept of loading angle can facilitate the design and simulation of FMMG and magnetically geared machines (MGM) based on the finite element method under different loading conditions.

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“…In addition, MGs have overload protection since there is no contact between the shafts, leading to higher reliability [1]. As a consequence, MGs are suitable for a variety of applications [2] such as in aircraft mechanical transmission [3][4][5], wind power generation [6][7][8][9], wave energy conversion [10], traction [11] and aerospace [12]. The idea of MGs was first established in the early 20 th century.…”

Section: Introductionmentioning

confidence: 99%

Torque ripple investigation in coaxial magnetic gears

et al. 2022

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Magnetic gears offer significant advantages such as low noise and vibration level, lower maintenance and higher reliability compared to mechanical gears and are suitable for many applications in the industry. The coaxial magnetic gear has been extensively discussed in the literature, since it achieves higher torque densities amongst other magnetic gear configurations. The magnetic field is generated by permanent magnets mounted on the two rotors and a modulator between them. The modulator consists of ferromagnetic segments that are typically encased in a resin in order to increase its stiffness without compromising the generated magnetic field. However, due to the development of radial forces, oscillations of the ferromagnetic segments occur, which lead to torque ripples that affect the operation of the coaxial magnetic gear drive in applications where accuracy is required. This work introduces a computationally lightweight analytical 2D model in order to determine the applied radial force on the ferromagnetic segments at each angle of rotation of the two rotors and henceforth calculate the displacement of these segments using FEA. In this way it is possible to assess the variation of the torque (ripple) versus the angle of rotation of the input or output shaft. A parametric investigation examining the influence of the ferromagnetic segment thickness on the resulting torque ripple of a specific drive was carried out illustrating the benefits of the analytical models developed herein.

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Designing and Experimentally Testing a Magnetic Gearbox for a Wind Turbine Demonstrator

Cited by 30 publications

References 23 publications

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Load Angle of Flux Modulated Magnetic Gears

Torque ripple investigation in coaxial magnetic gears

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